/**
* License Agreement.
*
* Rich Faces - Natural Ajax for Java Server Faces (JSF)
*
* Copyright (C) 2007 Exadel, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1 as published by the Free Software Foundation.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
package org.ajax4jsf.resource.cached;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;
import javax.faces.FacesException;
import javax.faces.context.FacesContext;
import org.ajax4jsf.Messages;
import org.ajax4jsf.resource.InternetResource;
import org.ajax4jsf.resource.ResourceBuilderImpl;
import org.ajax4jsf.resource.ResourceNotFoundException;
import org.ajax4jsf.resource.util.URLToStreamHelper;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
* @author shura
*
*/
public class CachedResourceBuilder extends ResourceBuilderImpl {
private static final Log log = LogFactory
.getLog(CachedResourceBuilder.class);
private static final int DEFAULT_CAPACITY = 10000;
private long counter = 0;
private DualLRUMap cache;
/*
* (non-Javadoc)
*
* @see org.ajax4jsf.resource.ResourceBuilderImpl#decrypt(byte[])
*/
protected byte[] decrypt(byte[] data) {
// dummy - data not send via internet.
return data;
}
/*
* (non-Javadoc)
*
* @see org.ajax4jsf.resource.ResourceBuilderImpl#encrypt(byte[])
*/
protected byte[] encrypt(byte[] data) {
// dummy - data not send via internet.
return data;
}
/*
* (non-Javadoc)
*
* @see org.ajax4jsf.resource.ResourceBuilderImpl#getResourceDataForKey(java.lang.String)
*/
public Object getResourceDataForKey(String key) {
ResourceBean bean = (ResourceBean) cache.get(key);
if (null == bean) {
throw new ResourceNotFoundException("Resource for key " + key
+ "not present in cache");
}
return bean.getData();
}
/*
* (non-Javadoc)
*
* @see org.ajax4jsf.resource.ResourceBuilderImpl#getResourceForKey(java.lang.String)
*/
public InternetResource getResourceForKey(String key)
throws ResourceNotFoundException {
ResourceBean bean = (ResourceBean) cache.get(key);
if (null == bean) {
throw new ResourceNotFoundException("Resource for key " + key
+ "not present in cache");
}
return super.getResourceForKey(bean.getKey());
}
/*
* (non-Javadoc)
*
* @see org.ajax4jsf.resource.ResourceBuilderImpl#getUri(org.ajax4jsf.resource.InternetResource,
* javax.faces.context.FacesContext, java.lang.Object)
*/
public String getUri(InternetResource resource, FacesContext facesContext,
Object data) {
ResourceBean bean;
if (null == data) {
bean = new ResourceBean(resource.getKey());
} else {
if (data instanceof byte[]) {
// Special case for simple bytes array data.
bean = new ResourceBytesDataBean(resource.getKey(),
(byte[]) data);
} else {
bean = new ResourceDataBean(resource.getKey(), data);
}
}
String key = (String) cache.getKey(bean);
if (null == key) {
synchronized (this) {
counter++;
key = bean.hashCode() + "c" + counter;
}
cache.put(key, bean);
} else {
// Refresh LRU
cache.get(key);
}
String resourceURL = getFacesResourceURL(facesContext, key);
if (resource.isSessionAware()) {
resourceURL = facesContext.getExternalContext().encodeResourceURL(
resourceURL);
}
if (log.isDebugEnabled()) {
log.debug(Messages.getMessage(Messages.BUILD_RESOURCE_URI_INFO,
resource.getKey(), resourceURL));
}
return resourceURL;// context.getExternalContext().encodeResourceURL(resourceURL);
}
/*
* (non-Javadoc)
*
* @see org.ajax4jsf.resource.ResourceBuilderImpl#init(javax.servlet.ServletContext,
* java.lang.String)
*/
public void init()
throws FacesException {
super.init();
// Create cache manager.
Properties properties = getProperties("cache.properties");
int capacity = DEFAULT_CAPACITY;
String capacityString = properties.getProperty("cache.capacity");
if (null != capacityString) {
try {
capacity = Integer.parseInt(capacityString);
} catch (NumberFormatException e) {
log.warn("Error parsing value of parameters cache capacity, use default value "+DEFAULT_CAPACITY, e);
}
}
cache = new DualLRUMap(capacity);
counter = getStartTime() - 1158760000000L;
}
/**
* Get properties file from classpath
*
* @param name
* @return
*/
protected Properties getProperties(String name) {
Properties properties = new Properties();
InputStream props = URLToStreamHelper.urlToStreamSafe(CachedResourceBuilder.class
.getResource(name));
if (null != props) {
try {
properties.load(props);
} catch (IOException e) {
// TODO Auto-generated catch block
log.warn(Messages.getMessage(Messages.READING_PROPERTIES_ERROR,
name), e);
} finally {
try {
props.close();
} catch (IOException e) {
// Can be ignored
}
}
}
return properties;
}
}